研究目的
To investigate the generation of visible spectrum via optimized supercontinuum generation in tapered ordinary fibers using ultrashort laser pulses, focusing on the influence of taper geometry (specifically downtapering section length) and pulse duration on the spectral output.
研究成果
The study demonstrates successful optimization of supercontinuum generation in tapered ordinary fibers using an ultrashort fiber laser source. Tuning pulse duration allows for adjustable spectral power in the visible range, and longer downtapering section lengths enhance conversion efficiency to shorter wavelengths. This is attributed to prolonged proximity to the zero-dispersion wavelength during pulse propagation. The findings provide insights for designing compact, tunable supercontinuum sources with applications in fields requiring high-intensity visible light.
研究不足
The mechanical stability of micrometer taper waists limits their lengths up to 10 cm, potentially restricting the interaction length for SCG. The study is experimental and may not cover all possible taper geometries or pulse parameters. The use of specific equipment (e.g., Vytran GPX-3600) and fibers (SMF-28) may limit generalizability to other materials or setups.
1：Experimental Design and Method Selection:
The study uses a fiber chirped pulse amplification system in a master oscillator power amplifier (MOPA) configuration to generate ultrashort laser pulses. Supercontinuum generation (SCG) is investigated in tapered ordinary fibers (TOFs) made from standard SMF-28 optical fiber, with emphasis on optimizing taper geometry (downtapering section length) and pulse parameters (duration and chirp).
2：Sample Selection and Data Sources:
Tapered fibers are fabricated using a glass processor (Vytran GPX-3600) with specific geometries (downtapering section lengths, taper waist diameters, and lengths) as detailed in Table 1. Laser pulses are generated and characterized using the MOPA system.
3：Laser pulses are generated and characterized using the MOPA system.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes a fiber mode-locked seed laser, tunable chirped fiber Bragg grating (CFBG), fiber amplification stages pumped with laser diodes at 976 nm, acousto-optic modulator, grating compressor, autocorrelator for pulse duration monitoring, integrating sphere for spectral measurements, and spectrometer. Materials include standard SMF-28 optical fibers for tapering.
4：Experimental Procedures and Operational Workflow:
Pulses from the seed laser are stretched using a tunable CFBG, amplified in two stages, compressed with a grating compressor, and coupled into the tapered fibers. Supercontinuum spectra are measured with an integrating sphere to avoid spectral-dependent losses. Pulse duration is tuned from 370 fs to 15 ps using the CFBG, and spectra are recorded for different taper geometries and pulse durations.
5：Data Analysis Methods:
Spectral data is analyzed to observe changes in the visible part of the spectrum. Comparisons are made between tapers with different downtapering section lengths and pulse durations to assess optimization of SCG.
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